[mythtv] [PATCH] Clear up media monitoring weirdisms

[J. Donavan Stanley]

Attached are small handful of patches:

mm_libmyth.patch does the following:
1) Prevents sending status changed signals when transitioning to/from 
MEDIASTAT_UNKNOWN.  This fixes a nasty loop in where MythMusic's CDDB 
code & the media monitoring would start a loop of notifications making 
it impossible to create a playlist with a CD in the drive.
2) Cleans up how we handle transitions to a couple states.
3) Performs an unmount of a data disk if we determine it's a DVD.  
Otherwise the disk cannot be ejected since it's mounted.


mm_mythmusic.patch removes the double call to REG_MEDIA_HANDLER.  It 
didn't hurt anything but would cause a warning to be spit out.

mm_mythdvd.patch registers MythDVD and a handler for DVDs.


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